Go Set a Watchman is a novel by Harper Lee that was published in 2015 by HarperCollins (US) and Heinemann (UK). Written before her only other published novel, To Kill a Mockingbird (1960), Go Set a Watchman was initially promoted as a sequel by its publishers. It is now accepted that it was a first draft of To Kill a Mockingbird, with many passages in that book being used again.
The title comes from the Book of Isaiah in the Hebrew Bible: "For thus hath the Lord said unto me, Go, set a watchman, let him declare what he seeth" (Chapter 21, Verse 6), which is quoted in the book's seventh chapter by Mr. Stone, the minister character. It alludes to Jean Louise Finch's view of her father, Atticus Finch, as the moral compass ("watchman") of Maycomb, Alabama, and has a theme of disillusionment, as she discovers the extent of the bigotry in her home community. Go Set a Watchman tackles the racial tensions brewing in the South in the 1950s and delves into the complex relationship between father and daughter. It includes treatments of many of the characters who appear in To Kill a Mockingbird.